Teach client to find Homebrew installations on Apple Silicon

[andyleejordan]

Since /opt/homebrew is now used instead of /usr/local.

This annoyed me when setting up a new MacBook.

[Copilot]

Pull Request Overview

This PR adds support for detecting Homebrew-installed PowerShell on Apple Silicon by updating both the platform detection logic and related tests. Key changes include:

• Defining new constants and functions to locate Homebrew installations in src/platform.ts.
• Updating the enumeration order to search for Homebrew stable, LTS, and preview installations on macOS.
• Enhancing tests in test/core/platform.test.ts to validate the correct discovery of Homebrew installations.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/core/platform.test.ts	Adds test cases for Homebrew installation paths (stable, LTS, preview).
src/platform.ts	Introduces constants and functions to locate Homebrew installations on macOS.

Comments suppressed due to low confidence (3)

test/core/platform.test.ts:598

• The Homebrew stable installation path is set to "/usr/local/bin/pwsh", but on Apple Silicon it should be "/opt/homebrew/bin/pwsh". Please update this path to reflect the correct location.

{ exePath: "/usr/local/bin/pwsh", displayName: "PowerShell (Homebrew)", supportsProperArguments: true }

test/core/platform.test.ts:604

• The Homebrew LTS installation path is set to "/usr/local/bin/pwsh-lts", but it should be "/opt/homebrew/bin/pwsh-lts" for Apple Silicon. Consider updating to the correct path.

{ exePath: "/usr/local/bin/pwsh-lts", displayName: "PowerShell LTS (Homebrew)", supportsProperArguments: true }

test/core/platform.test.ts:614

• The Homebrew preview installation path is set to "/usr/local/bin/pwsh-preview", but it should be "/opt/homebrew/bin/pwsh-preview" for Apple Silicon. Please update this accordingly.

{ exePath: "/usr/local/bin/pwsh-preview", displayName: "PowerShell Preview (Homebrew)", supportsProperArguments: true }

[andyleejordan]

Yet again bit by our platform tests sharing macOS and Linux. I'm blaming Copilot for that one. The paths in the tests were right I swear, and then they were changed...